lothrop



(No Model.) 4

- A. A. LOTHROP.

CATCH FOB SHADE ROLLERS. No. 298,004. Patented May 6, 1884.

n rnzim mun-warm Wmmm 0.1;

' UNITED STATES PATENT OFFICE.

ALSON A. LOTHROP, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO CHARLES H. CUSHMAN, OF SAME PLACE.

CATCH FOR SHADE-ROLLERS.

SPECIFICATION forming part of Letters Patent No. 298,00 4, dated May 6, 1884.

Application filed June 27, 1863. (No model.)

To all whom it may concern.-

Be it known that I, ALSON A. LOTHROP, a citizen of the United States, residing at Boston, in the county of Sufiolk and State of Massachusetts, have invented a new and useful Improvement in Catches for Shade-Rollers, of which the following is a specification.

The object'of my invention is to provide a device or catch which, without interfering with the winding and unwinding of the spring-roller when secured to the window-frame, will allow;

it to be removed therefrom without having the spring run down. The means by which I accomplish this result are shown in the accompanying drawings, in which- Figure l is a front elevation of the device as used with a shaderoller, the wooden cap of which is shown in section. Fig. 2 is a crosssection, showing the position of the parts when the spring is winding. Fig. 3 is a cross-section of same when the spring is unwinding. Figs. 4 and 5 are details showing the construction and position of my improved catch or clutch.

The same letters indicate similar parts in the different drawings.

The spring shade-roller shown is ofordinary construction, and consists of a metallic rod, a a, provided with anotched end for insertion in the shade-fixture, (not shown,) a wooden roller through which this rod a runs, the spring (not shown) which is coiled around this rod being contained within this roller, the cap end of which, I), only is shown in the drawings. This rod is providedwith a grooved disk, 0,

rigidly attached thereto, and turning with it inside the wooden cap, and with a washer, d, inserted between the flat side of the disk and the end of the cap b. This groove in this disk 0 is preferably filled with a strip of felting, e, to make a close contact without the wearing away of the disk. The catch or clutch f is adapted and intended to fit loosely into a groove, 9, in the periphery of the disk 0, of sufficient size to allow the catch asmall amount 5 of play, as shown in Figs. 2 and 3, the inner surface of the groove or depression g being the reverse of the surface off, which is intended to come in contact therewith. In other words, where a depression is found in the surface of f, a corresponding projection is made on the inner surface of g, and vice versa. This de-' pression or groove 9 grows shallower toward the top, as shown in Figs. 2 and 3, and the length off is such that it Will lie easily only in the position shown in Fig. 2, while as soon as it is brought toward the line a: as it begins to bind on the inner surface of the cap I). F1 om this it is obvious, I'thiuk, without further explanation; that when the roller tends to move in the direction indicated by the arrow in Fig. 2 no hinderance is offered by the catch f. When, however, the motion is as indicated by Fig. 3, the catch f, being loose and free, lags behind the motion of the roller-rod inside the cap, and being thus drawn into the narrower part of the groove 9, binds, as shown in Fig. 3, and prevents the spring from running down.

I claim I I a The combination ,of the clutch f, groove 0 grooved disk 0, and strip of felting 6, when used for shade-rollers, as hereinbefore shown and described.

ALSON A. LOTHROP.

Witnesses:

' W. P. PREBLE, J r.

WM. S. ROGERS. 

